Self-cleaning liquid-filter.



Patented Aug. 10, 1915.

T. LINKE.

SELF CLEANING LLQUID FILTER.

APPucATloN man sEPT.24`. 1914.

@l il i N' D sTArEs PATENT OFFICE..

THOIDORE LINKE, OF NEW-YORK, N. Y.

snitir-cLnANIneV IQIQUInriLTER.

Specication of Letters Patent.

Patented Aug. 10, 1915.

'Application ined september 24, 1914.1, serial No. 363,272.

Y provements in filters and more particularly to a self-cleaningliquidnfilter'kwhich is an improvement upon myv prior Patent No,590,707, dated the28th day of September, 1897. Y

The improvements forming the object of this invention reside in thegeneral structure vof the filter 'so asto greatly facilitate theassembling of the parts thereofbesides to obviate the necessity ofapplying the holder for the filtering medium or porous stone from oneendwhile the filteringmedium is applied at the opposite end andafterward secured in position, by permitting the stone which is intheform of atube or cylinder with an axial bore, to be mounted on theholder and identified asa wholeprovision being also made for attachingan Voperating part for the holder in order to control the discharge offiltered or unfiltered water or to entirely cut olf the same; to securesaid/` operating member in position and to provide-novel means for theremovable attachment of apair of scraping blades forming Y aself-cleaning means for the filtering medium or porous stone whereby theimpurities which lodge on the surface thereof may be convenientlyremoved to prevent retardation to the filtering of the watertherethrough.

With the above and other objects in view, the inventionv resides in thepeculiar combination and arrangement of parts to be hereinafter morefully described, illustrated and claimed, it being also an object toprovide a device which is simple in construction, durable and efcient inoperation.

Reference is to be `had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views and in whichc Figure 1 is a sideelevation of my improved self-cleaning liquid filter; Fig. 2 is acentral vertical sectional o view thereof;

Fig.,v 3 is a horizontal cross sectional view taken on the line"`j3-3 ofFig. 1 looking downward; and'Fig. 4 is a perspective view of oneof thescraper blades.

As illustrated, the improved filter embodies a cylindrical'casing 10.having a reduced interiorly threaded bottom extension 11 provided with awrench engaging face or portiony 12. By means of this reduced eX-tension a bottom wall 13 surrounding the same is provided but the upperend of the casing is open and formed of an enlarged c eXteriorlythreaded portion 14 adapted for engagement byan interiorly threadedflange 15 of a cap yor cover 16 with an interposed packing washer or"gasket 17 Y to form an airtight joint between the connected parts. Thecap is provided with a central inlet opening 18 having a depending valveseat 19 surrounding, the same, while extending upwardly from the capconcentrically of the opening and enlarged relative thereto, is aninteriorly threaded flange 2O having a wrench engaging face asshown. Thepurpose of this flange is for'coupling'the device to a supply pipe orfaucet 21 with an interposed packing ring or washer 22 to form anairtight joint. The bottom wallof the casing is provided with an annularrecess 23 providing a seat for a packing gasket 24, all of said washersor gaskets being preferably ofrubber. c

Insertible through the top of the casing, before the application of thecap 16, is a holder 25 carrying the filtering medium or porous stone 26and as shown, said holder embodies an exteriorlythreaded part 27 engagedwiththe interior threads of the eXtension 11 and provided thereabovewith a reduced portion 28 smooth externally and provided with aplurality of apertures 29 therethrough spaced apart around the same inhorizontal alinement. Above the reduced portion 28, which has a boreofcorresponding diameter tothe bore of the portion 27, the holder isVformed withy an internally threaded and inwardly extending flange 30and an outwardly extending flange 31 integral therewith to overlie thegasket 24 while the flange 31 in turn carries a packing ring or gasketl32. Theupper portion of the holder is in the form of a skeleton-likemember 33 having a plurality of vertical recesses 34 of substantially.V-shaped cross section with slots 35V communicating with the bore i ofthe holder, or in 'other words, castto pro- 26 is Lengaged oversaidskeleton-like mem#V ber to seat upon the gasketl32, it may besecured in position as by means of a fastening screw 38 threaded in tothe aperture .with a'washer 39 engaged thereon to close the upper endofthe bore ofthe porous stone, while a washer 40, also mounted on kthescrew in contact withv the head thereof, serves to coperate with theseat 19 for preventing the discharge of water into the filter casing.Engaged with the interior kthreads of the iiange is a discharge tube orspout 41 for the filtered water, the same eXtending through anddepending from the holder to provide a surrounding annular space 42constituting an independent discharge passage for uniltered water orliquid.

In order to turn `or rotate the holder to move the same vertically s oas to engage the washer 40 with the seat 19 to prevent the discharge ofwater into the ilter casing; to move said holder to an intermediateposition with the washer 40 unseated or. disengaged Aso from the seat 19and the flange 31 unseated from the gasket 24 so as to permit theydischarge of water into lthe filter casing whereby thesame will escapethrough the aper- 1 ture 29 and out through the annular space throughthe tube 41, an operating member' 43 is provided, the same being in theform of a hand wheel, preferably having a knurled periphery or edgeportion and havingl a recess 44 in its upper face toreceive theextension 11 and allow a greater range of movement for the holder' withrespect thereto. Thelower. end of the portion 27 of the holder isprovided with an unthreaded portion 45 and a reduced eXteriorly thread-ved portion 46 therebeneath, both having a flattened portion 47 so thatthe operating member or wheel 43, when mounted on the smoothportionthrough the medium of its relatively thin hub. portion 4S, willbe held against rotation by engagement of a flattened wall 49 with theportion 47 so that said .wheel or operating memberwill be re movablyLkeyed to the holder. A jam nut50 is engaged on the threaded portion 46to bind against the operating member or wheel said nut is designed toextend beneath'y the lower end of the holder to form a contiguous boreor discharge passage for the unfiltered f water'around the dischargetube for the iiltered water.

'f n As designated by the title of the invention, means are provided toclean thefilteringmedium or porous stone such as tripoh,

. of foreign matter .and impurities held in the water, and which whenthe water is forced through the filteringstoneor the like are caused to`lodge thereon, invorder to prevent retardation to the filtering of thewater. For this purpose the filter casing carries or hasformed therewithat diametrically opposite sides of its inner surface, vertical ribs 51which taper toward their ends, as shown in Fig. .2. Each of these ribsis provided` with a relatively narrow transverse slot 52 flush with theinner surfaceof the casing, or

end forming the scraping edge thereof bent f inwardly as shown at 54,while each blade tapersA toward its opposite end and is provided with areduced portion 55 producing shoulders 56 above and below the same.

These blades are removably secured to the ribs 51 by passing the reducedportions 55 through the slots 52 and bending said reducedportions'against the sides ofthe ribs in the manner shown in'. Figs. 3and 4 of the drawings so that the scrapers are held e from displacementby the shoulders 56 on one side of each rib and by the bent portions onthe other sides, and( owing tothe resiliencyr of the metal forming thesame their scraping edges are positively held in f* contact with theouter face or periphery of the cylindrical stone forming the filteringmedium, as shown in full lines in Fig. 3, and caused to move inward asthe stone wears in the scraping action, as indicated in dot-and-dashlines in Fig. 3.

Considerable importance is placed upon the manner of attaching thescraping blades to the interior of the casing, owing to the fact thatthe blades in constant use become worn by the action of the stone orfiltering medium. In this manner the vblades become short andineflicient for scraping the latter of impurities and foreign matter,and as these blades must necessarily be renewed, and as the improvement,that is, by the provision of a detachable metal cleaner or scraper inthe form of the blades as specified, the

blades can be obtained and applied by the f user without the necessityof skilled help.

It will be obvious that greater facility is permitted in assembling theparts of the filter, for renewing a stone or applying new blades thanhas heretofore been provided and especially in connection with thedevice of which this application is an improvement. Y

Having thus described my invention, what l claim as new and desire tosecurelby Letters Patent is z* l. ln a filter of the class described, incombination, a casing having provision for connection with a supply pipeor faucet, means mounted in the casing for cutting off or permitting thedischarge of water thereinto and having independent discharge passagesfor filtered and unfiltered water, a filtering stone carried by saidmeans around which the water passes within the casing to be dischargedin an unfiltered condition and through which the water is forced to bedischarged in a filtered condition, a plurality of ribs vertically7 atthe inside of the casing and having vertical slots therethrough andscraper blades of resilient metal having reduced portions passed throughthe slots and bent to removably anchor the same to the ribs, said bladesbeingcurved and bent inward to constantly contact with the surroundingsurface of the stone and to remove impurities therefrom when the latteris turned.

2. The combination with a lter including a casing and a cylindricalfiltering stone mounted therein and through which water is adapted to beforced for ltering the same; of a rib on the inside of the casing havinga slot therein and a scraper blade of resilient metal having one endprovided with a tongue to pass through the slot for securing the bladein position when the tongue is bent against the rib and away from theinner face ofthe casing, the free end of the blade being designed tofrictionally engage the stone for scraping the same.

3. A self cleaning liquid filter, comprising a casing having a reducedbottom extension interiorly threaded, a cap for the casing and havingprovision for connection with a supply pipe or faucet, a holdercomprising an upper part and a lower part, said lower part havingexterior threads engaged with said interiorly threaded extension andhaving a smooth portion thereabove of uniform diameter throughout itslength and reducedV diameter with respect to the threaded porbottomextension of the casing, said holder above said threaded part beingformed with an inwardly extending flange with an upwardly extendingpart, and an outwardly extending flange in alinement with the last namedflange, the upper part of the holder having a plurality of closelyadjacent sectorshaped openings therethrough with beveled top and bottomwalls andy the outwardly extending flange being formed with a beveledportion contiguous with the bottom beveled walls of said openings, saidcasing having a rabbeted seat in the bottom thereof communicating withthe extension at the inside, a packing gasket vmounted in said seat andpermitting free movement of the reduced smooth portion therethrough,said holder through the medium of said openings being provided withspaced and tapered web portions and slots inwardly thereof communieatingwith the bore of the holder, a packing washer seated upon the outwardlyextending flange and beveled portion thereof, a tubular filtering mediumsupported on said outwardlyextending flangey and contacting with thewasher, means at the top of the holder for removably securing thefiltering medium in position and forcing the same against said washer,means removably mounted at the inside of the casing to scrape saidfiltering medium, a discharge tube for filtered water having engagementwith said inwardly extending flange and an operating member removablyfixed to the holder below the exteriorly threaded part thereof andlimited against movement upward by said part, said operating memberserving to permit rotation of the holder with respect to the casing toseat and unseat the outwardly extending flange with respect tothegasket, whereby the fluid or water discharged into the casing will Vpassout in a filtered or un.- iltered condition, substantially as specified.

ln testimony whereof l have signed my name to this specication in thepresence of two subscribing witnesses.

` THEODORE LNKE. Witnesses: JOHN E. Benen,

yPHiLrr D. ROLLHAUS.

Copesvof this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Y ,Washingtoin D. G.

